They’re real hatchetfish, but I should mention that the picture was likely taken when they were already dead. Both mouths open to that degree, the texture of the eyes (especially evident in the specimen at the right,) and the skin hugging the bone so tight above the mouth and above the eyes, as well as the positions of the pectoral fins make me think these are dead fish in a staged picture to make it look like they’re looking at the camera.
This is often done because it’s hard to get pictures of live hatchetfish - photography in the deep sea is extremely dependent on luck and on who decides to get close enough, and very few live specimens are ever brought to the surface. I remember when I was in college my Intro Biology textbook had a horrible staged picture of two deep-sea fish and a shrimp in an obvious condition of decomposition. I was angry at first at the ruse, but I have since buried the hatchet.
I should note in the interests of full disclosure that I have never seen a live hatchetfish, but I have seen a few dead ones.